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Highly excited atoms have electrons with large principal quantum numbers. Such Rydberg atoms have unique properties and are of interest to astrophysicists. For hydrogen atoms with large n, derive a relation for the separation of energy levels. Calculate this separation for n=100; also calculate the average radius, the geometric cross section, and the ionization energy. Could a thermal collision with another hydrogen atom ionize this Rydberg atom? What minimum velocity of the second atom is required? Could a normal-sized neutral H atom simply pass through the Rydberg atom leaving it undisturbed? What might the radial wavefunction for a 100s orbital be like?
The current concentration of carbon dioxide in the atmosphere is 378 ppmv. Annual anthropogenic additions to the atmosphere are about 8 Gt (as C) of which about 4 Gt are removed into the oceans and terrestrial environment.
200g of magnesium phosphate and 250.0g of copper bromide react, how much copper phosphate will be produced?
Tell what type of chemical reaction is represented by the following chemical equation.
Using the equation below assume we want to use 2.3 g of Fe(no3)3 in our experiment. how much NaOH will be needed for a complete reaction?
use of fossil fuels.we use fossil fuels oil gas coal for many things power for transportation electricity production
For a given chemical reaction, ?H = -32.0 kJ/mol and ?S = -98.0 J/mol*K. Estimate the free energy change for the reaction at 775 C and 1 bar pressure. I believe it to be 70.7 kJ/mol
Several rate constants were measured for a particular reaction at several temperatures. It was found that k = 0.0173 at 923 K, and k = 0.00919 at 773 K. What is the activation energy, Ea , for this reaction?
using a solution of kmno4 has a percent transmittance of 27.3 percent when observed in a 1.15-cm cell at a wavelength
What is the vapor pressure (in mm Hg}) of a solution of 15.5g of glucose in 82.0g of methanol at 27 degrees C? The vapor pressure of pure methanol at 27 degrees C is 140 mm Hg.
For drug development, it is crucial to optimize the half-life of elimination of the drug so that the drug has long enough to act but not enough time to cause harmful side-effect.
Two moles of an ideal gas originally at 380 torr and 298K are compressed at constant temperature to 680 torr. Find the initial and final volumes.
Give the systematic names of these compounds. Spelling counts! (a) CuI(s) (b) Fe2O3(s) (c) CoF2(s) (d) FeO(s)
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